Add PpapiDecryptor which wraps a CDM plugin.

webkit/media/crypto/ppapi_decryptor.h

Index: webkit/media/crypto/ppapi_decryptor.h
diff --git a/webkit/media/crypto/ppapi_decryptor.h b/webkit/media/crypto/ppapi_decryptor.h
new file mode 100644
index 0000000000000000000000000000000000000000..0aa6ef7fce2c218b6351dbb67b3d07c3021826e0
--- /dev/null
+++ b/webkit/media/crypto/ppapi_decryptor.h
@@ -0,0 +1,61 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WEBKIT_MEDIA_CRYPTO_PPAPI_DECRYPTOR_H_
+#define WEBKIT_MEDIA_CRYPTO_PPAPI_DECRYPTOR_H_
+
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "media/base/decryptor.h"
+
+namespace media {
+class DecryptorClient;
+}
+
+namespace webkit {
+namespace ppapi {
+class PluginInstance;
+}
+}
+
+namespace webkit_media {
+
+class PpapiDecryptor : public media::Decryptor {
+ public:
+  PpapiDecryptor(
+    media::DecryptorClient* client,
+    const scoped_refptr<webkit::ppapi::PluginInstance>& plugin_instance);
+  virtual ~PpapiDecryptor();
+
+  // media::Decryptor implementation.
+  virtual void GenerateKeyRequest(const std::string& key_system,
+                                  const uint8* init_data,
+                                  int init_data_length) OVERRIDE;
+  virtual void AddKey(const std::string& key_system,
+                      const uint8* key,
+                      int key_length,
+                      const uint8* init_data,
+                      int init_data_length,
+                      const std::string& session_id) OVERRIDE;
+  virtual void CancelKeyRequest(const std::string& key_system,
+                                const std::string& session_id) OVERRIDE;
+  virtual void Decrypt(const scoped_refptr<media::DecoderBuffer>& encrypted,
+                       const DecryptCB& decrypt_cb) OVERRIDE;
+
+ private:
+  // Callback for the plugin to hand back the decrypted data.
+  void DataReady(const DecryptCB& decrypt_cb, const uint8* data, int data_size);
+
+  // TODO(xhwang): Need to figure out how the CDM plugin fires key events
+  // (e.g. KeyMessage).
+  media::DecryptorClient* client_;
+  scoped_refptr<webkit::ppapi::PluginInstance> cdm_plugin_;
+
+  DISALLOW_COPY_AND_ASSIGN(PpapiDecryptor);
+};
+
+}  // namespace webkit_media
+
+#endif  // WEBKIT_MEDIA_CRYPTO_PPAPI_DECRYPTOR_H_